parrott



Renner P. rnnno'r'g or coLn spinne, Nnw' .mine

IMPROVEMENT IN THE IVIANUFACTURE OF ORDNANCE.

, Specification forming part oi Letters Patent No. 33,401, dated October l, i861.

To @ZZ whom t may concern:

Be it known that I, ROBERT P. PARRoTr, of Cold Spring, in the county of Putnam and State of New York,have invented a new and useful Improvement inthe Manufacture of Ordnance; and -I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming Vpart of this specification, in which- 4 4 Figure l is a central longitudinal section of a cannon, and' Fig; 2 a transverse section of the same. Similar letters of reference indicate corresponding parts in both figures.

,This invention relates to the application otV a Wrought-iron re-enforce to a gun having its body or main -portion of .cast-iron; and it consists in a peculiar inode of shrinking the :re-enforce' on thebody, 4whereby the heating and expansion of the body in a very high degree by heat communicated to it .from the re-enforce is prevented and theyre-enforce is caused to be` drawn equally close all around the body. y y To enable others skilled in the art to apply my invention to practice, I will proceed to ex- -plainr the manner in which it` is performed." The cast-iron main portion-or body A is or maybe made like any1` cast-iron gun, either with its breech a like a gun of A'the .ordinary kind, or with, a breech, made of a separate piece or pieces of metal either permanently secu red tothe body for loading at the muzzle or 'movable to provide for loading at the breech; or what I have called the ybody, to distinguish it from the re-enforce, may be a cast-iron gun which has been already finished for use, but requires n strengthening to enable it to carry heavier projectiles than those for which it was originally intended; or acast-iron gun which, not having been originally intended for a rifled gun, has been weakened by riding.

The wrought-iron re-,enforce B may be made in various ways?, but 'thatwhich l consider the best is to vtake a bar of square iron of `ipr0per dimensions, coil it spirally upon a mandrel, then heat it to a Welding heat and place it in a strong .cast-iron cylinder and part offthe same casting,

hammer it endwise till the coils are Welded together and a `sonnddlollow Wrought-iron cylinder is formed. VThe cylinder thus forged is to be bored and turned ina lathe to the proper size'and thickness. p

The body A, having been previously bored, has that portion of its exterior which is to re- .ceive the re-enforce turned to a cylindrical form'and of a diameter about one-sixteenth of an inch to the foot larger than the diameter which the interior of the re-enforce has in a cold state. It is then placed in a horizontal or nearly-horizontal positionupon suitable ,supportsv or bearings, Which permitit to be rotated on its axis orrolled and which Will permit the re-enforce to be put on when sui'liciently expanded by heating it, and a vpipe is introduced through the muzzle for the purpose of conveying al constant and copious stream of cold Water to the bottoni ofthe bore. When the re-enforce has been properly heated and so expanded as to enable it to pass loosely onto the body, it is placed in its proper posi- `tion thereon and cold Water is introduced into the bore by the aforesaid pipe and the body is rotated on its axis. By this Arotary movement the re-enforce, while hanging loosely on the body, is prevented from remaining in contact therewith at one part, and so prevented from cooling tirst at one part, which would be the case if I let it reina-in hanging with one partonly in contact with the body and'v which would set the re-eutorce at that part and prevent Ait from being drawn equally close at all points around the body. 'By the introduction ofthe stream of Water, which runs out at the muzzle of the gun, the heat imparted to the body from the re-enforce is carried od and the body prevented from being thereby materially-expanded, and so lessening the pinch or vforce with which the reenforee binds finally upon it. As soon as the re-enforce is found to bind upon the body I cover it with sand or other material which is a good non-conductor of heat7 continuing the flow of water through the body until the entire gun is cold. The object of so'covering up the re-enforce is to prevent the outer portion from cooling and contracting quicker than the inner portieri and to cause it to be oooled .from tho interior, by which it is made sy, by'rotating the body while water. is inno bind more firmly on the body. vtl'oducod info the bore.

What I claim as' my invention, and desire l to secure by Letters Patent, is-'-' l y ROBERT I. PARROT'I.

, The within-described modo of shrinking Witnesses: thjvrought-iron rfa-enforce upon the cast- G,PAULD1NG,.

liron body of a piece of ordnance-thm; is to ELISHA NELSON.4 

